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Tropical Depression Ignacio Forecast Discussion Number 7
2021-08-03 10:47:42| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Tue Aug 03 2021 000 WTPZ45 KNHC 030847 TCDEP5 Tropical Depression Ignacio Discussion Number 7 NWS National Hurricane Center Miami FL EP102021 200 AM PDT Tue Aug 03 2021 Strong east-northeasterly shear has continued to take a toll on Ignacio overnight with a small cluster of remaining deep convection now displaced over 60 n mi to the southwest of the center. An ASCAT overpass that arrived shortly after the release of the previous advisory indicates that Ignacio has weakened to a tropical depression with peak winds of around 30 kt. That is also supported by a blend of the latest Dvorak T- and CI-numbers from TAFB and SAB. The strong shear and marginal SSTs should continue to cause gradual weakening over the next 12-24 hours, and Ignacio is expected to become a remnant low Tuesday night. The GFS, ECMWF, and UKMET all show the remnant low opening up into a trough of low pressure shortly thereafter, and so does the official forecast. Ignacio is moving slower toward the northwest than before, or about 315/5 kt. A further reduction in forward speed is predicted over the next 12-24 hours as Ignacio weakens and is steered by the weaker low-level flow. The track guidance again suggests that the remnant low will turn northeastward before dissipating, and the updated NHC track forecast has been adjusted accordingly. FORECAST POSITIONS AND MAX WINDS INIT 03/0900Z 20.1N 116.3W 30 KT 35 MPH 12H 03/1800Z 20.9N 116.9W 25 KT 30 MPH 24H 04/0600Z 21.2N 116.6W 20 KT 25 MPH...POST-TROP/REMNT LOW 36H 04/1800Z...DISSIPATED $$ Forecaster Brown
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